7W3O

Crystal structure of human CYB5R3

7W3O の概要

• エントリーDOI: 10.2210/pdb7w3o/pdb
• 分子名称: NADH-cytochrome b5 reductase 3 soluble form, FLAVIN-ADENINE DINUCLEOTIDE (3 entities in total)
• 機能のキーワード: er-phagy, ufmylation, ufm1, reductase, oxidoreductase
• 由来する生物種: Homo sapiens (Human)
• タンパク質・核酸の鎖数: 5
• 化学式量合計: 161064.72

構造登録者

Noda, N.N. (登録日: 2021-11-25, 公開日: 2022-12-07, 最終更新日: 2023-11-29)

主引用文献

Ishimura, R.,El-Gowily, A.H.,Noshiro, D.,Komatsu-Hirota, S.,Ono, Y.,Shindo, M.,Hatta, T.,Abe, M.,Uemura, T.,Lee-Okada, H.C.,Mohamed, T.M.,Yokomizo, T.,Ueno, T.,Sakimura, K.,Natsume, T.,Sorimachi, H.,Inada, T.,Waguri, S.,Noda, N.N.,Komatsu, M.
The UFM1 system regulates ER-phagy through the ufmylation of CYB5R3.
Nat Commun, 13:7857-7857, 2022

PubMed Abstract: Protein modification by ubiquitin-like proteins (UBLs) amplifies limited genome information and regulates diverse cellular processes, including translation, autophagy and antiviral pathways. Ubiquitin-fold modifier 1 (UFM1) is a UBL covalently conjugated with intracellular proteins through ufmylation, a reaction analogous to ubiquitylation. Ufmylation is involved in processes such as endoplasmic reticulum (ER)-associated protein degradation, ribosome-associated protein quality control at the ER and ER-phagy. However, it remains unclear how ufmylation regulates such distinct ER-related functions. Here we identify a UFM1 substrate, NADH-cytochrome b5 reductase 3 (CYB5R3), that localizes on the ER membrane. Ufmylation of CYB5R3 depends on the E3 components UFL1 and UFBP1 on the ER, and converts CYB5R3 into its inactive form. Ufmylated CYB5R3 is recognized by UFBP1 through the UFM1-interacting motif, which plays an important role in the further uyfmylation of CYB5R3. Ufmylated CYB5R3 is degraded in lysosomes, which depends on the autophagy-related protein Atg7- and the autophagy-adaptor protein CDK5RAP3. Mutations of CYB5R3 and genes involved in the UFM1 system cause hereditary developmental disorders, and ufmylation-defective Cyb5r3 knock-in mice exhibit microcephaly. Our results indicate that CYB5R3 ufmylation induces ER-phagy, which is indispensable for brain development.

PubMed: 36543799
DOI: 10.1038/s41467-022-35501-0

実験手法

X-RAY DIFFRACTION (2.46 Å)